Have object and its shadow behind object appear in front
If you want to place the 3D car in a 2D image, you need to model some geometry.
Use the knife tool (K in Edit mode) on the background image that you have. Cut out the shapes of the pole/lantern, the tower, the wall, and the stairs. Cut it, then select the faces, duplicate them (Shift+(D) and separate them (P). Add a Soldify modifier and a Bevel modifier to the new object cut out.
For the tree, you only need half of the vertical outline. Then use the Screw modifier. While doing so, check the correct face orientation and origin.
Extrude the floor and correct the texture mapping in the UV editor if necessary. For the wall in any case. Add a Bump node to the stair's material. Set up a few lights.
Done. The car is now in the &quot;image&quot;.